Title: Compression behaviour of TiZrNbHf refractory high-entropy alloy upon high strain rate and high temperatures loading

Authors: Siyuan Zhang; Kerong Ren; Wentao Xu

Addresses: School of Mechanics and Safety Engineering, Zhengzhou University, Zhengzhou, 450000, China ' Air Force Engineering University, Aviation Maintenance NCO Academy, Xinyang, 464001, China ' School of Mechanics and Safety Engineering, Zhengzhou University, Zhengzhou, 450000, China

Abstract: The mechanical properties of high entropy alloys (HEAs) determine their future application and development prospects, making it critical to study the mechanical properties of HEAs. In this study, the compression behaviour of TiZrNbHf refractory high entropy alloy (RHEA) was studied and the result showed that the yield strength of the RHEA varied at different strain rates, exhibiting strain rate sensitivity. The mechanical properties at different temperatures demonstrated a thermal softening effect. The test results indicated that the strain hardening behaviour of the RHEA was changed due to the lath grains produced at a high strain rate and the nano-sized fine grains produced at high temperatures. A modified Z-A constitutive model proposed in this study by changing the strain hardening term could predict the mechanical behaviour of the RHEA. The findings of this study provide insights into understanding the mechanical response characteristics of RHEAs under high strain rate loading and high temperatures.

Keywords: RHEA; refractory high-entropy alloy; split Hopkinson pressure bars; thermal softening; compression behaviour; modified Z-A constitutive model; finite element simulation.

DOI: 10.1504/IJVSMT.2024.142155

International Journal of Vehicle Systems Modelling and Testing, 2024 Vol.18 No.3, pp.193 - 227

Received: 04 Apr 2024
Accepted: 06 May 2024
Published online: 10 Oct 2024 *

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